Merged revisions 288640 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r288640 | tilghman | 2010-09-23 22:42:37 -0500 (Thu, 23 Sep 2010) | 2 lines
  
  Export timersub for platforms which do not have it
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@288641 65c4cc65-6c06-0410-ace0-fbb531ad65f3